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If you're the type of person who needs to screw driver permit don't bother trying to change your own watch battery. It would be nice if the tool came with instructions. That aside I was able to figure it out. When using the tool do not use just two points of contact. My watch at 6 slots for the square bits and I used 3 bits which allowed the tool to grab at three points of contact. You can use just two bits but that may cause excess pressure on those two points of contact causing the tool to slip out of the slot. It will also help with the tool bits aligne with the slot if you put a drop of oil on the barrel of the bit so that the edges of the Drive will aline with your cut outs.
Verified purchase: Yes | Condition: New
This will open your case back but don't expect a high quality product. Comes with a variety of attachments. Not sure how useful most of them are, I used the standard one and it opened the back. But my tool arrived in a box that was stained with machine oil and there was more of it in the tool itself.
Verified purchase: Yes | Condition: New
Works okay. The bits did arrive rusty due to humidity and not being coated. A little rubbing with WD40 cleaned it right up though. However the biggest disappointment was that one of the little bearings that holds the bits in was missing. So I had to wrap one of the bits with some scotch tape to keep it from falling out. This wasn't a deal breaker though because it still functions just fine and for under twelve greenbacks it was the best deal I could find. It works for changing large case watch batteries and it already paid for itself so it's a give and take. Just be aware there can be some quality issues.
Verified purchase: Yes | Condition: New
The package arrived very fast. The wrench itself is very sturdy and high quality. It comes with several different attachments for different grooves for the watch case back. Large size for cases that are 52mm. And a lot cheaper option for replacing batteries especially if you are a watch collector.
Verified purchase: Yes | Condition: New
with limited use, i may say it works fine. i made a minor adjustment on the "teeth" to make the distance almost equal or make it more symmetrical. since am used to my old "2 teeth" tool, i am having a bit of difficulty setting up (align and hold) those 3 teeth but i know it should be better than my old unit.
Verified purchase: Yes | Condition: New